| Role of Mg on Structure and Mechanical Properties in Alloy 718 |
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| 作者单位： | Xu Zhichao，Xie Xishan Qu Bo，Chen Guoliang Radavich John F Dept. of Material Science and Engineering School of Materials Engineering Purdue University |
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| 摘 要： | The role of Mg in alloy/718 has been systematically investigated. Mg raises not only high temperature tensile and stress-rupture ductilities but also increases considerably smooth and notch stress-rupture life. Mg containing alloy 718M is free of stress-rupture notch sensitivity. Mg improves creep and fatigue interaction properties (LCF or cyclic stress rupture) at any grain size. The basic role of Mg is equilibrium segregation at grain boundaries which helps to change continuous grain beundary (5-Ni3Nb morphology to discrete globular form which has a retardation effect on intergranular fracture. Mg promotes the change from intergranular to transgranular fracture mode.
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Role of Mg on Structure and Mechanical Properties in Alloy 718 |
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| Authors: | Xu Zhichao Xie Xishan Qu Bo Chen Guoliang Radavich John F Dept of Material Science and Engineering School of Materials Engineering Purdue University |
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| Abstract: | The role of Mg in alloy/718 has been systematically investigated. Mg raises not only high temperature tensile and stress-rupture ductilities but also increases considerably smooth and notch stress-rupture life. Mg containing alloy 718M is free of stress-rupture notch sensitivity. Mg improves creep and fatigue interaction properties (LCF or cyclic stress rupture) at any grain size. The basic role of Mg is equilibrium segregation at grain boundaries which helps to change continuous grain beundary (5-Ni3Nb morphology to discrete globular form which has a retardation effect on intergranular fracture. Mg promotes the change from intergranular to transgranular fracture mode. |
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| Keywords: | superalloy creep and fatigue mechanical properties |
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